package com.sky.service.impl;


import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void insertShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        //补充字段dish_id、setmeal_id、dish_flavor
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //补充字段user_id,只能查询自己的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //判断新增的商品是否在购物车中
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.listShoppingCart(shoppingCart);

        if (shoppingCartList != null && shoppingCartList.size() == 1) {
            //如果已经存在，就更新数量，数量加1
            shoppingCart = shoppingCartList.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber() + 1);
            shoppingCartMapper.updateCartNumberById(shoppingCart);
        } else {
            //如果不存在，插入数据，数量就是1
            //判断当前添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null) {
                //添加到购物车的是菜品
                Dish dish = dishMapper.getDishById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            } else {
                //添加到购物车的是套餐
                Setmeal setmeal = setmealMapper.getSetmealById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insertShoppingCart(shoppingCart);
        }
    }

    /**
     * 查询购物车
     *
     * @return
     */
    @Override
    public List<ShoppingCart> listShoppingCart() {
        ShoppingCart shoppingCart = ShoppingCart.builder().userId(BaseContext.getCurrentId()).build();
        List<ShoppingCart> shoppingCarts = shoppingCartMapper.listShoppingCart(shoppingCart);
        return shoppingCarts;
    }

    /**
     * 清空购物车商品
     */
    @Override
    public void cleanShoppingCart() {
        ShoppingCart shoppingCart = ShoppingCart.builder().userId(BaseContext.getCurrentId()).build();
        shoppingCartMapper.deleteShoppingCart(shoppingCart);
    }

    /**
     * 删除购物车中的一个商品
     * @param shoppingCartDTO
     */
    @Override
    public void deleteShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //可能传菜品id，也有可能传套餐id
        ShoppingCart shoppingCart = new ShoppingCart();
        //补充字段dish_id、setmeal_id、dish_flavor
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //补充字段user_id,只能查询自己的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //查询出购物车数据
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.listShoppingCart(shoppingCart);
        ShoppingCart shopping = shoppingCartList.get(0);
        shopping.setNumber(shopping.getNumber() - 1);
        //如果数量为0，则直接删除
        if (shopping.getNumber() >= 1){
            shoppingCartMapper.updateCartNumberById(shopping);
        }else {
            shoppingCartMapper.deleteShoppingCart(shopping);
        }

    }
}
